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Attachment 1 - Noise Report ANV
Attached to the e-mail Response to Submissions, Accoustic Report, Amended Proposal Plans, Ext to Decision Period - MCU17/0073.
Acoustics Noise Vibration 122 Arrabri Ave Mt Ommaney QLD 4074 0466 300 931 ABN: 23102422446 17 May 2018 Ref: 0145 GSL Church Alterations Rpt 02 Attention: Shane Adamson Good Shepherd Lutheran Church c/- Adamson Town Planning 28 Eenie Creek Road, Noosaville QLD 4566 Dear Sir, RE: GOOD SHEPHERD CHURCH, NOOSAVILLE – PROPOSED CHURCH ALTERATIONS - ACOUSTIC ASSESSMENT This report presents the results of the acoustic impact assessment undertaken by Acoustics Noise Vibration for the proposed church alterations to Good Shepherd Lutheran Church, located at 115 Eumundi Road, Noosaville. Concerns regarding the church extension have been raised through Council and this report provides technical information regarding potential impacts. INTRODUCTION The church is part of the Good Shepherd Lutheran School site and the existing church building is mainly used for school and church services, church youth group and after school and evening orchestral music. Figure 1 shows the location of the church building on the school site. The nearest residential receptors are located along the school north-eastern boundary. The nearest residences along the boundary would presently experience noise from: the Childcare Centre children and car park (not part of the school or church); people using the existing church and the existing timber deck and stairs; the car park adjacent the school/ residential boundary; the students and staff using the school buildings and facilities; and road traffic on Eumundi Road. This assessment considers potential noise impacts that may be caused by the proposed alterations on residences along the north-eastern boundary. Acoustics Noise Vibration 1 0145 GSL Church Alterations Rpt 02
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Figure 1 Site Plan NOISE MONITORING Ambient noise monitoring was undertaken from 3 – 11 May 2018, at Location L1 as shown in Figure 2. The location was chosen to be representative of the nearest residential premises along the north-eastern boundary. Noise levels at the logger location included student’s voices, people using the church, cars in the car park, birds, and road traffic noise from Eumundi Road. The road noise sets the background noise levels. Acoustics Noise Vibration 2 0145 GSL Church Alterations Rpt 02
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Figure 2 Locality Plan and Noise Monitoring Location The results of the noise monitoring is summarised in Table 1, for a range of parameters. Background (BG or LA90) noise data was processed in accordance with the Department of Environment and Heritage Protection’s document Planning for Noise Control procedure to determine the Rating Background Levels1. Meteorological data from the Bureau of Meteorological Brisbane station was used in the validation of the background noise data. 1 The rating background level is a single figure for each time period that represents the typical minimum LA90 levels for day, evening and night time periods. It is the median of the lowest 10th percentile of the LA90 levels. Acoustics Noise Vibration 3 0145 GSL Church Alterations Rpt 02
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Table 1 Ambient Noise Levels2 dB(A)
Weekdays + weekend Lmax L1 L10 L90 Leq Leq Log Av RBL
Day 73 63 54 45 53 57 43
Evening 61 53 47 39 45 46 38
Night 56 48 42 35 40 44 30
Week days only Lmax L1 L10 L90 Leq Leq Log Av RBL
Day 74 63 55 45 53 57 43
Evening 61 52 46 38 44 45 35
Night 55 47 40 33 39 44 29
Weekend Only Lmax L1 L10 L90 Leq Leq Log Av RBL
Day 70 60 54 46 52 57 42
Evening 62 55 50 42 47 47 41
Night 60 53 47 39 44 46 37
Sunday Lmax L1 L10 L90 Leq Leq Log Av RBL
Day 71 61 54 46 53 61 44
Evening 62 55 50 42 47 48 41
Night 61 54 49 39 46 47 38
NOISE CRITERIA
Discussions with the Noosa Shire Council have confirmed that they refer to the Environmental Protection Act
for noise criteria.
The Environmental Protection Act section 440U Air Conditioning Equipment – sets criteria of BG + 5dB(A),
7am to 10pm, and BG + 3dB(A) from 10pm to 7am.
Section 440W Indoor Venues sets the criteria of BG + 5dB(A), 7am to 10pm, and BG + 3dB(A) from 10pm to
Midnight, and “inaudible” from Midnight to 7am. However 440W notes that the 7am – 10pm criteria do not
apply if the “building is, or is part of, an educational institution, and the use of the building as an indoor venue
is organized by or for the educational institution for non-commercial purposes of the institution”.
2 Noise levels are expressed as a range of parameters. L1, L10, L90 are the “A-weighted” levels experienced for 1%,
10% and 90% of the time period. Leq is the “A-weighted” level with the same energy as the actual fluctuating noise
level, and may approximate the average level. The Lmax is the maximum level and is the highest level recorded during
the time period for an event with the meter set to Fast response time. All values have been averaged over the Day
(7am – 6pm), Evening (6pm – 10pm) and Night (10pm – 7am) time periods.
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Thus the noise criteria for staff and student noise radiating from the building do not apply when it is used for
educational purposes.
The Environmental Protection (Noise) Policy sets acoustic quality objectives for residential and other uses.
The external acoustic objective for a dwelling is 50dB(A) for day and evening periods. These can be used to
set upper limits for plant noise criteria developed using the Environmental Protection Act.
The church air conditioning plant is only expected to operate during the day and evening periods. Given the
plant may be used on weekdays and weekends, the noise assessment is based on the criteria that apply
during this period.
Using the measured rating background levels, the project criteria are presented in Table 2.
Table 2 Plant Noise Criteria dB(A)
Day Evening
Criteria Source
7am – 6pm 6pm – 10pm
DEHP EP Act & EPP Noise 48 43
Noise criteria for people on the Friendship Terrace can be assessed using the EPAct Section 440W approach.
Given the noise is not continuously present the levels should also be compared against the existing ambient
levels. Proposed criteria are presented in Table 3.
Table 3 Friendship Terrace Noise Criteria dB(A)
Day Evening
Criteria Source
7am – 6pm 6pm – 10pm
DEHP EP Act & EPP Noise 48 43
Existing Ambient Leq 53 45
NOISE ASSESSMENT
The proposed church alterations include the following:
worship centre;
offices and amenities;
covered friendship terrace; and
meeting room and amenities (lower level).
The floor plans for the church alterations are shown in Figures 3 and 4.
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Figure 3 Ground Floor Plan – Existing and New Alterations Acoustics Noise Vibration 6 0145 GSL Church Alterations Rpt 02
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Figure 4 Lower Ground Floor Plan - Existing and New Alterations
Noise generated by the proposed alterations will include:
people inside the worship centre;
people inside the offices;
people inside the meeting room on the lower ground level;
people on the friendship terrace; and
air conditioning plant.
Worship Centre, Offices and Meeting Room
The worship centre will be used for worship services for the school and the congregation. The noise levels
inside the worship centre will be the same as the services that are held in the existing naturally ventilated
church building. While the worship centre will be closer to the residential boundary, it will be air conditioned
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so that doors and windows can be kept closed which will significantly reduce noise levels radiating to the
nearest residences. This will also reduce the number of events held in the existing church building, thus
further reducing noise impacts from the church buildings. The worship centre is being acoustically designed
to control reverberation which will again reduce noise levels.
One of the complaint items referred to noise from chairs being moved on the timber floor of the existing
building. It is expected that this will relate in part to the setting out of chairs for worship services. The new
worship centre will have concrete floors (ie. rather than timber) and the seats will be set out permanently
for services. This will both reduce noise from seats being moved in the new worship centre, and also reduce
the number of times seats have to be set out in the existing church building.
The proposed alterations include allowance for the existing church building to be air conditioned. This will
further reduce noise radiating to the nearest residences by enabling the doors and windows to be closed.
The offices are not expected to generate audible noise at the nearest residences. The meeting room on the
lower level will be air conditioned so that doors and windows can be kept closed which will control noise
radiating to the nearest residences.
Friendship Terrace
The friendship terrace will be used for informal gatherings after church services and for other gatherings. It
is located outside the kitchen to enable people to have morning or afternoon tea. Noise levels from the
covered friendship terrace have been predicted as shown in Table 4 to provide an indication of the likely
range of noise levels.
Table 4 Friendship Terrace Noise Levels dB(A)
Source Noise Level at Nearest Day Evening
Source
Level Residence 7am – 6pm 6pm – 10pm
Large group ~ 100
65dB(A) @ 9m 56dB(A)
people
48 – 53 43 - 45
Small group up to 10 54 dB(A) @ 9m 45dB(A)
people having a
discussion
From Table 4 it can be seen that for large groups noise levels may exceed the Day time criteria by 3-8dB(A)
and Evening criteria by 11-13dB(A) respectively. For smaller groups the levels will meet the Day time criteria
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and may marginally exceed the evening criteria by 2dB(A). The terrace will not be used continuously, but
rather will be used for relatively short periods before or after events in the church building, and this
effectively reduces the potential noise impact.
Noise Control Measures –
Noise from people on the Friendship Terrace, will be reduced at the nearest houses due to the design
of the building. The roof construction will include acoustic absorption panels to reduce the buildup
of reverberant noise, and the roof will be raked to reflect sound back towards the church rather than
projecting it towards the residential boundary;
Hours of use of the friendship terrace could be limited to prior to 9pm, and the number of times it is
used during the evening could be limited; and
The existing school/ residential boundary fence is presently a paling fence. An acoustic fence could
be investigated to confirm if it would provide useful attenuation of noise at the nearest residences.
It is expected that these measures will enable impacts from the friendship terrace to be managed.
Air Conditioning Plant
Plant associated with air conditioning and ventilation for the alterations will be designed to meet the noise
criteria provided in Table 2, at the nearest residences. The condenser plant is planned to be located under
the friendship terrace.
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CONCLUSIONS It is concluded that noise from the church alterations may result in a reduction in noise from inside the church as the new building will be air conditioned to enable doors and windows to be kept closed. Air conditioning plant can be designed to meet the Environmental Protection Act and Environmental Protection Noise Policy criteria. Noise from the friendship terrace may exceed the noise criteria for larger groups using the terrace, particularly if used during the evening, however it is expected that the noise impact can be managed. RECOMMENDATIONS It is recommended that the measures to control noise from the friendship terrace discussed in Noise Control Measures section of this report be investigated to minimise potential impacts at the nearest residences, and mechanical plant be designed to meet the noise criteria in Table 2. Yours sincerely, Acoustics Noise Vibration David Borgeaud Principal Acoustics Engineer Acoustics Noise Vibration 10 0145 GSL Church Alterations Rpt 02